Fundamentals of travelling wave ion mobility revisited: I. Smoothly moving waves
Fundamentals of travelling wave ion mobility revisited: I. Smoothly moving waves
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DOI：
10.1016/j.ijms.2018.03.007
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发表时间：
2018-05-01
影响因子：
1.8
通讯作者：
Giles, K.
中科院分区：
文献类型：
--
作者：
Richardson, K.;Langridge, D.;Giles, K.
我们给出了行波离子迁移率(TWIM)的一个推广和简化的理论处理，并证明了它在对称波形的特殊情况下与已发表的结果是等价的。利用这一结果，我们导出了平稳运动的正弦TWIM装置中离子的轨迹和渡越时间的精确表达式，为在这种装置中直接(即未校准)测量CCS提供了可能性。然后，我们证明了在实际装置中需要考虑的两个效应，即波形的非谐分量和速度松弛，可以在我们的方法中微扰地包括在内。我们考虑了速度松弛对校准的CCS测量的影响，并检查了包括扩散的实际处理的重要性。(C)2018爱思唯尔B.V.保留所有权利。
We give a generalised and simplified theoretical treatment of travelling wave ion mobility (TWIM), and demonstrate that it is equivalent to previously published results in the special case of symmetric waveforms. Using this result, we derive exact expressions for the trajectory and transit time of ions in a smoothly moving sinusoidal TWIM device, opening up the possibility of direct (i.e. uncalibrated) CCS measurement in such a device. We then show that two effects that would need to be considered in a realistic device, namely anharmonic components of the waveform and velocity relaxation, can be included perturbatively in our approach. We consider the effect of velocity relaxation on calibrated CCS measurement and examine the importance of including a realistic treatment of diffusion. (C) 2018 Elsevier B.V. All rights reserved.